Shreve is the Torreyes of the pitching staff, still somehow around despite increasing competition. He is a second lefty besides Chapman, not that they need that, but he is out of options and has been very good in the spring (6.2 3 0 0 3 7), so the 7th spot is his, at least temporarily.
I said it a few places but I guess not in this thread, I would have moved Warren and auditioned some of my high-ceiling guys for the 6th and 7th spots this season, since the first five guys are so good (Acevedo is the one I most want to see, and he is already on the 40 man). They need more guys in place long-term with Warren and Robertson as FAs after 2018 and Betances after 2019, and actually Robertson has looked so good since coming back that I might offer him an extension now through 2020, 2/23 which would keep the same AAV (his previous deal was 4/46).
That might be good for both sides, Robertson doesn't have to worry about dealing with who knows what version of a FA market next winter and gets more security in a place he obviously likes. It wouldn't change NY's money situation this year and they have plenty of money to spend going forward. He was NY's most reliable guy down the stretch last year, the two longest outings of his career in NY's first two winner-take-all games against MIN and CLE, a ridiculous 6 scoreless innings in those two games combined. Anyway, just a thought.